Well I read it and loved it. There are one or two LOL moments, but overall it's pathos and how her behaviour effects other people.
There are so many themes in it, so many events in other people's lives and so much goes on that I am not sure the point that Townsend was trying to make as she made so many.
It was not a waste of time by any means and I ending up really caring about Alexander, if nobody else. Eva's twins are autistic and their sub plot develops quite alarmingly. There is very irritating and toxic character in it called Poppy who frankly, just irritates and I'm not sure of her purpose unless it was to illuminate the differing reactions to her from the different characters.
It also had a bit of social commentary in which Eva, the main character briefly becomes a cult figure which nicely outlined how today's Twitter society are all too ready to read too much meaning into something and how they are so needy that they try and see a guru in the simplest of folk.
I won't spoil the ending but it was poignant, but not tragic.
As I said there is no clear singular message, unless you can conclude that everything is messy and nothing is simple and one decision affects people not only adversely, but also in ways that are both dramatic and banal.